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The four types of symbols in an Intelligent Mail barcode. The Intelligent Mail barcode is a height-modulated barcode that encodes up to 31 decimal digits of mail-piece data into 65 vertical bars. [2] The code is made up of four distinct symbols, which is why it was once referred to as the 4-State Customer Barcode.
There have been four formats of Postnet barcodes used by the Postal Service: A 5 digit (plus check digit) barcode, containing the basic ZIP Code only, referred to as the "A" code. 32 bars total. A 6 digit (plus check digit) barcode, containing the last 2 digits of the ZIP Code and the 4 digits of the ZIP+4 Code, referred to as a "B" code.
If the barcode is present, the mail can be sent directly to a sorter. The five codes have the following uses: [1] FIM A is used for mail bearing regular postage and an Intelligent Mail Barcode. It is commonly used by preprinted courtesy reply mail and metered reply mail, but may be applied to any mail to speed delivery.
Information-Based Indicia is a two-dimensional PDF417 or data matrix barcode combined with human-readable information. The barcode data contains such information as amount of postage, origin zip code, destination, mail class, weight, confirmation/tracking numbers, and a cryptographic signature. The human-readable information shows at a minimum ...
The operator converts the information on the mailpiece into abbreviated codes and enters the data into the computer. This data is sent back to the MLOCR site where it is matched with the unique barcode on the back of the un-coded mailpiece, and a barcode is then printed on the mailpiece like the rest of the mail.
Some scammers may put the return label on an advertisement and remove all shipping information except for the barcode. This may cause the company to throw out the 'return', thinking it is junk mail. This serves the same purpose as a package redirection scam; the company believes they mismanaged the return and refunds the scammer's money.